APML: Attention Profiling Markup Language
CCXML: Call Control eXtensible Markup Language
CML: Chemical Markup Language
CMRL: Concise Message Routing Language
DHTML: Dynamic Hypertext Markup Language
dicML: Dictionary Markup Language
DSDL: Document Schema Definition Languages
DSML: Directory Service Markup Language
e-business XML: Electronic Business using eXtensible Markup Language
ebXML: Electronic Business using eXtensible Markup Language
FDCML: Field Device Configuration Markup Language
FicML: Fiction Markup Language
FieldML: Field Modelling/Markup Language
GuideML: Guide Markup Language
GXL: Graph Exchange Language
HTML: HyperText Markup Language
JSDL: Job Submission Description Language
JSML: Java Speech Markup Language
KML: Keyhole Markup Language
LGML: Linguistics Markup Language
LOGML: Log Markup Language
MathML: Mathematical Markup Language
MML: Music Markup Language
MXML: Magic eXtensible Markup Language
NCL: Nested Context Language
NRL: Namespace Routing Language
NVDL: Namespace-based Validation Dispatching Language
ODRL: Open Digital Rights Language
OML: Outline Markup Language
OPML: Outline Processor Markup Language
OWL: Web Ontology Language
PMML: Predictive Model Markup Language
railML: Railway Markup Language
RecipeML: Recipe Markup Language
REL: Rights Expression Language
RELAX NG: REgular LAnguage for XML Next Generation
REST: Representational State Transfer
RPC: Remote Procedure Call
RTML: Remote Telescope Markup Language
SALT: Speech Application Language Tags